/Engine/Source/Runtime/Slate/Public/Widgets/Input/SSpinBox.h
A Slate SpinBox resembles traditional spin boxes in that it is a widget that provides keyboard-based and mouse-based manipulation of a numeric value. Mouse-based manipulation: drag anywhere on the spinbox to change the value. Keyboard-based manipulation: click on the spinbox to enter text mode.
template<typename NumericType> class SSpinBox : public [SCompoundWidget](API\Runtime\SlateCore\Widgets\SCompoundWidget)